Roller-mill



(No Model.) 2 Sheets-Sheet 2.

J. DAWSON.

ROLLER MILL.

No. 310,127. Patented Dec. 30, 1884.

W4 WITNESSES: v INVENTDR.

N. PETERS Plmto blhnumphnr. Wnshvngiuu. D c

UNITED STATES PATENT OFFICE.

JAMES DAXVSON, OF \VILMINGTON, DELAlVARE.

ROLLER-MILL.

SPECIFICATION forming part of Letters Patent No. 310,127, dated December 30, 1884.

Application filed August 11, 1884.

T0 (LZZ whom it may concern:

, Be it known that I, J AMES Dawson, a citizen of the UnitedStates, and a resident of Wilmington, in the county of New Castle and State of Delaware, have invented certain new and useful Improvements in Roller-Mills; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, and in which- Figures 1 and 2 are side elevations taken from opposite sides of the machine; and Fig. 3 is an end elevation, partly in section, of the same.

The same letters refer to the same parts in all the figures.

My invention has relation to belt-tighteners for roller-mills having two sets of rollers revolving at different rates of speed in each set; and it consists in the improved construction and combination of parts of sncha device, by means of which the belt of the two rollers of the two sets which revolve with the same speed may be tightened or loosened without interfering with the belt of the other two rollers, as hereinafter more fully described and claimed.

In the drawings hereto annexed, A designates the frame of the machine, the sides of which are provided with tubular lugs or sleeves B l3, forming bearings for a countershaft, 0. Upon the said sleeves are journaled bell-crank levers D and E, the lower arms of which are provided with swiveled studs F, having screwthreaded perforations, through which pass the ends of the hand-screws G, which are journaled in lugs or studs H, swiveled to the sides of the frame, and retained in the saidlugs by means of collars I. By means of the saidhand-screws the bell-crank levers are capable of being independently adjusted in the manner and for the purposes to be hereinafter described. The other arms of the levers D and E carry loose band wheels or pulleys J J One end of the counter-shaft O carries a spur-wheel, K, adjoining the lever D, between which and the said spur-wheel a washer, L, is interposed. The said spur-wheel meshes with apinion, M, secured or formed upon the inner side of the (No model.)

at the side of the frame having the lever D with band-wheels R S, and the shafts of the rolls 0 and P are provided at the opposite ends with band-wheels R and S T is a main driving-belt, which runs from the driving-pulley upon the main shaft (not shown in the drawings) over the band-wheel R, thence down under the tightening-wheel J, thence over the pulley S, and finally down back under the driving-pulley. It will thus be seen that it serves to impart to the rollers O andP a rotary motion in the direction indicated by the arrows. The pinion M on the wheel J meshes with the spur-wheel K, thus rotating the counter-shaft G in a reverse direction.

U is a belt or band running under the bandwheel N upon the opposite end of the countershaft, thence up over the band-wheellt down under the tightening-wheel J up over the band-wheel S, and finally back down under the wheel N. It will thus be seen that a rotary motion is imparted to the rolls in the direction indicated by the arrows, which is opposite to the direction in which the rolls Oand P are revolved, the motion having been reversed by the described arrangement of the spur-wheel K and pinion M. It will also be noticed that the rolls 0 and P are revolved at a greater rate of speed than the rolls 0 and P, the speed being reduced in its transmission to the counter-shaft 0 through the medium of the spur-wheel K from the pinion M, owing to the relatively small size of the latter. By manipulating the hand-screws Gthe belts or bands T and U may be tightened independ ently of each other through the medium of the tightening-wheels J J"-, journaled upon the ends of the bell-crank levers operated by the said hand-screws.

Having thus described my invention, I claim and desire to secure by Letters Patent of the United States In a roller-mill, the combination of aframe, two sets of rolls, cylindrical sleeves on the sides a 3mm of the frame, a counter-shaft journaled in the 1 ends of the roller-shafts,and suitable drivingsaid sleeves and having at one end a spurbelts, all arranged and operating substantially wheel and at the other end aband-Wheel, bellas and for the purpose set forth.

crank levers journaled upon the said sleeves, In testimony that]: claim the foregoing as my 1 5 5 hand-screws arranged to operate the saidbellown I have hereunto affixed my signature in crank levers, a band wheel and pinion jourpresence of two witnesses.

naled upon the free arm of one of the bell- Tu T "r crank levers, said pinion meshing with the spur-Wheel upon the counter-shaft, a tighten- \Vitnesses:

1o ing-wheel journaled upon the free arm of the \VM. BAGGl-JR,

other bell-crank lever, band-wheels upon the \VM'. A. Knnnc'y. 

